Surface and downhole shear wave seismic methods for thick soil site investigations

Hunter, James A.; Benjumea, Beatriz; Harris, James B.; Miller, Richard D.; Pullan, Susan E.; Burns, Robert; Good, Ron L.

doi:10.1016/s0267-7261(02)00117-3

Cited by 63 publications

(31 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The down hole or cross hole profiling methods allow in situ measurements of the shear-wave velocity with depth. However, the performance of these methods for site characterization can be rather difficult and expensive in urban areas because these methods require boreholes [19,20]. To overcome these problems, non-invasive seismic exploration has emerged as a promising alternative to estimate the shear wave profiles and the resonance frequencies.…”

Section: Geophysical Investigationmentioning

confidence: 99%

Correlation Between Shear Wave Velocity (Vs) and SPT Resistance (N) for Roorkee Region

Kirar

Maheshwari

Muley

2016

Int. J. of Geosynth. and Ground Eng.

View full text Add to dashboard Cite

For ground improvement, assessment of damage during an earthquake is very important issue which in turn depends on the ground motion. The characteristics of an earthquake motion at a site depend on the shear wave velocity (V s ). The shear wave velocity profile at a site may not be readily available however, the numbers of blows (N) from standard penetration test (SPT) are readily available. This paper presents a development of reliable correlation between V s measured by multi channel analysis of surface wave tests and N measured using SPT at various sites in Roorkee region. These tests have been carried out at ten different sites in Roorkee region (within a radius of 30 km). The SPT samples are tested in the laboratory for index properties. Roorkee is situated in high seismic zone, therefore the study is important for this region. Based on the statistical assessments, an empirical correlation between V s and N was developed. This is done separately for all types of soils, sands only and clays only. The developed relations fall within the range of other relations developed worldwide for other sites. A comparison with available relations is also presented. The proposed relations will be helpful in seismic microzonation of the region as ground motion is one of the important parameters.

show abstract

Section: Geophysical Investigationmentioning

confidence: 99%

Correlation Between Shear Wave Velocity (Vs) and SPT Resistance (N) for Roorkee Region

Kirar

Maheshwari

Muley

2016

Int. J. of Geosynth. and Ground Eng.

View full text Add to dashboard Cite

show abstract

“…Ground penetrating radar (GPR) defines the thicknesses of different layers of substructure [12][13]. Down-hole seismic test is suitable for estimating the shear wave velocities of different trackbed materials [14]. On the other hand, most of the geophysical methods present some difficulties in trackbed investigations.…”

Section: Site Selection and Prospectionmentioning

confidence: 99%

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

View full text Add to dashboard Cite

Abstract. Railway track-bed materials are mostly in unsaturated state, and their hydro-mechanical properties depend strongly on their water contents or suctions. In France, problematic soils such as collapsible loess and swelling marl can be origin of instability problems for new lines for high speed trains, while the hydro-mechanical behaviour of interlayer soil formed mainly by interpenetration of ballast and subgrade soil is of concern for conventional lines. In the latter case, the main challenge relies in the large variability of the interlayer soils owing to the variability of natural subgrade soils involved in the railway network. In this paper, a study on interlayer soils is presented, that covers a large spectrum of aspects: geotechnical/geophysical site characterisation, laboratory investigation into the hydraulic behaviour and mechanical behaviour as well as the mud pumping/interlayer creation phenomena, and field monitoring. The combined effect of water content and fines content were emphasized in the laboratory investigation, whilst interaction between atmosphere and track was focused on in the field monitoring. The results show clearly that it is of paramount importance to consider the unsaturated aspect of track-bed materials when analysing the overall behaviour of tracks, in particular when clay is involved in fine fraction.

show abstract

“…Ansal et al 2004;Slob et al 2002;Olieveira 2004;Street et al 2001). The areas located on young unconsolidated sedimentary deposits experienced greater amplification of ground motion (Hunter et al 2002). In 2001, the epicentre of Bhuj earthquake was about 400 km away from Ahmadabad (India), but the city was highly affected by earthquake because it was located over the younger alluvial deposits (Ranjan 2005).…”

Section: Introductionmentioning

confidence: 99%

Ambient noise measurements in Rawalpindi–Islamabad, twin cities of Pakistan: a step towards site response analysis to mitigate impact of natural hazard

et al. 2015

View full text Add to dashboard Cite

Earthquakes are one among the highly dangerous geological hazards. The damage from earthquakes is greatly influenced by the local geological conditions. The history of Pakistan is full of severe earthquakes that caused the mass destruction at national scale. Major earthquake-affected areas in Pakistan are mainly concentrated in the north and western sections of the country. Site response analysis is an initial step towards seismic risk assessment. The present study aims at local site effects by acquiring data along 105 sites of Rawalpindi-Islamabad, the twin cities of federal capital of Pakistan, by applying H/V spectral ratio method. Out of the data acquired for 105 sites, data for 88 sites were considered reliable after observing reliability conditions determined by SESAME guidelines devised in 2004. Fundamental frequency f 0 of soft sediments, amplitude A 0 of corresponding H/V spectral ratios, thickness of soft sediments residing on the bedrock and soil vulnerability index K g over 88 reliable data sites within the study area were estimated and analysed. The results show that the fundamental frequency of the sediments reflects variation and lies within a wide range between 0.6 and 14.4 Hz. Similarly, amplification factor A 0 up to 5.5 was observed at a site. Overburden thickness of soft sediments H also indicates high variation and has been calculated in the range of 1.7-316.5 m. As far as K g is concerned, it is also highly variable and is lying in the range of 0.30-62.7. These results will help in designing a policy to mitigate the impact of seismic hazard in the study area.

show abstract

Surface and downhole shear wave seismic methods for thick soil site investigations

Cited by 63 publications

References 20 publications

Correlation Between Shear Wave Velocity (Vs) and SPT Resistance (N) for Roorkee Region

Correlation Between Shear Wave Velocity (Vs) and SPT Resistance (N) for Roorkee Region

Unsaturated railway track-bed materials

Ambient noise measurements in Rawalpindi–Islamabad, twin cities of Pakistan: a step towards site response analysis to mitigate impact of natural hazard

Contact Info

Product

Resources

About